Skip to Main Content
GEOREF RECORD

Tephroite from the Val Graveglia metacherts (Liguria, Italy); mineral data and reactions for Mn-silicates and Mn-Ca-carbonates

Gabriella Lucchetti
Tephroite from the Val Graveglia metacherts (Liguria, Italy); mineral data and reactions for Mn-silicates and Mn-Ca-carbonates
European Journal of Mineralogy (February 1991) 3 (1): 63-68

Abstract

Tephroite coexists with rhodonite and manganoan calcite in the Val Graveglia metacherts, replacing the braunite + quartz (+ or - haematite) assemblages at decreasing oxygen fugacity, as a consequence of circulating CO (sub 2) -bearing, Ca-rich, hydrous fluids. Tephroite is almost pure phase (99.25 mol % Te) and rhodonite has 82.4 mol % MnSiO (sub 3) . Later fluid infiltration along fractures resulted in the replacement of the tephroite-rhodonitebearing assemblage by bementite and carbonate, possibly in response to increasing XCO (sub 2) . In this study, tephroite is chemically analysed by electron microprobe and examined by X-ray diffraction, optical and DTA methods.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 3
Serial Issue: 1
Title: Tephroite from the Val Graveglia metacherts (Liguria, Italy); mineral data and reactions for Mn-silicates and Mn-Ca-carbonates
Pages: 63-68
Published: 199102
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 1 p.
Accession Number: 1994-052604
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, 2 anals.
N43°45'00" - N44°40'00", E07°45'00" - E10°04'60"
N43°19'60" - N45°00'00", E07°30'00" - E12°45'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 199424
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal